Hi Sam My dual plug VW 2180 from Great Plains has 14mm on top and 10mm on the lower plugs. Your guy is correct that there is barely enough material to add the lower plugs. This is my 3rd set of heads from GPAS and no problems with this set up Chris Gardiner C GKRS 2180 VW 300 hours
Sent from my iPhone > On Jun 29, 2023, at 08:20, robert7721--- via KRnet <krnet@list.krnet.org> > wrote: > > Sam, > > I am not sure what an "AA" head is, but I am sure they are all similar. I > purchased mine replacement heads at Great Plains and had the cylinder head > machine work done by them as well. > > https://www.greatplainsas.com/0154a-/-043-cylinder-head.aspx > > Then can do the dual spark plugs machine work. They can do 10mm, 12mm, or > 14mm no problem. You can actually mix the types; my recent set has 12mm on > top and 10mm on the bottom. > > 10mm is fine for our VW engines. > > Thanks, > > Rob Schmitt > N1852Z (over 1000 hours) > Lees Summit MO > > > > > > -----Original Message----- > From: KRnet <krnet-boun...@list.krnet.org> On Behalf Of Samuel Spanovich via > KRnet > Sent: Wednesday, June 28, 2023 9:28 PM > To: krnet@list.krnet.org > Cc: Samuel Spanovich <spanovich...@gmail.com> > Subject: KRnet> VW AA Cylinder Head Dual Spark Plug Question > > Question for all the VW guru’s out there regarding dual spark plug setup, > specifically with AA Volkswagen cylinder heads. > > After one year of use with single ignition (the same ones that made it across > the country with me for the gathering last year), I recently took my AA heads > in to get them machined for a second spark plug, in hopes of converting back > to dual ignition. I told the machinist originally to keep the same size plug > as the original spark plug (12mm x 3/4” reach). > > However just before the machinist was supposed to perform the work, he > informed me that these particular heads (the AA ones) do not have enough > metal up near the combustion chamber and they are not thick enough to support > a 3/4” reach spark plug (he said he measured the width with calipers, and > compared it to an older MOFOCO cylinder head of mine, and the AA head was > supposedly not as thick. > > I asked if it would be possible to machine the second spark plug port for > something smaller, such as a 10mm x 1/2” reach plug. He sounded like it > would physically fit, however he sounded a little hesitant about running that > small of a plug into a fairly powerful engine (~80 HP). > > My question is whether or not it would be safe to have this type of setup (1x > spark plug 12mm x 3/4”, and a secondary plug 10mm x 1/2”). I was fairly > certain older VW heads accepted 14mm x 1/2”, so I was a little surprised when > the machinist said he wouldn’t think a 1/2” plug would suffice. > > Any input would be greatly appreciated; just trying to make sure I’m not > missing something completely obvious here. > > V/R > > Sam Spanovich > > Sent from my iPhone > -- > KRnet mailing list > KRnet@list.krnet.org > https://list.krnet.org/mailman/listinfo/krnet > > -- > KRnet mailing list > KRnet@list.krnet.org > https://list.krnet.org/mailman/listinfo/krnet -- KRnet mailing list KRnet@list.krnet.org https://list.krnet.org/mailman/listinfo/krnet
